Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 29 (1977), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Tyrosine hydroxylase activity correlated significantly with norepinephrine concentration and turnover, when results from regions containing predominantly noradrenergic terminals were compared, and with dopamine concentration and turnover when results from regions containing predominantly dopaminergic terminals were compared. Regions containing dopamine or norepinephrine cell bodies were characterized by higher tyrosine hydroxylase activities as compared to regions containing mostly nerve terminals. Higher levels of tyrosine hydroxylase activity and transmitter turnover were observed in regions containing dopaminergic terminals than in regions containing norepinephrine terminals. These findings are consistent with the view that tyrosine hydroxylase activity is linked to rates of catecholamine utilization by neurons in the CNS.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 40 (1983), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Norepinephrine and dopamine concentrations were determined by radioenzymatic assay in discrete gray matter regions of the spinal cords of rats with experimental allergic encephalomyelitis (EAE). Norepinephrine was depleted in most spinal cord regions of EAE rats compared with controls, whereas dopamine depletion in EAE rats was restricted to the cervical dorsal horn. There was a rostrocaudal gradient of norepinephrine reduction in the spinal cords of the EAE rats with most severe depletion in the lumbar region. The results of this experiment confirmed recent anatomical observations that suggested that catecholamine-fluorescent axons and terminals were damaged in spinal cords of rats with EAE.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 39 (1982), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: A modified filtration method for in vitro receptor binding was used to determine specific binding of [3H]naloxone to small regions of adult rat brain. Reliable determinations of ligand binding were quantified with about 50 μg of protein per assay tube. Large differences in [3H]naloxone binding were obtained between various brain nuclei, and these differences were consistent with prior determinations of opiate receptor densities in various rat brain nuclei using autoradiographic techniques.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 3 (1989), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Clinical isolates of Neisseria gonorrhoeae are commonly subject to growth inhibition by phenylpyruvate or by L-phenylalanine. A blockade of tyrosine biosynthesis is indicated since inhibition is reversed by either L-tyrosine or 4-hydroxyphenylpyruvate. Phenylalanine-resistant (PheR) and phenylalanine-sensitive (Phes) isolates both have a single 3-deoxy-D-arabino-heptulosonate 7-phosphate (DAHP) synthase that is partially inhibited by L-phenylalanine (80%). However, PheS and PheR isolates differ in that the ratio of phenylpyruvate aminotransferase to 4-hydroxyphenylpyruvate aminotransferase is distinctly greater in PheS isolates than in PheR isolates. A mechanism for growth inhibition is proposed in which phenylalanine exerts two interactive effects, (i) Phenylalanine decreases precursor flow to 4-hydroxyphenylpyruvate through its controlling effect upon DAHP synthase; and (ii) phenylalanine is largely transaminated to phenylpyruvate, which saturates both aminotransferases, preventing transamination of an already limited supply of 4-hydroxyphenylpyruvate to L-tyrosine.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 10 (1971), S. 257-261 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung In Fortsetzung einer früheren Untersuchung wird in der vorliegenden Arbeit die Spannungsverteilung in einer viskoelastischen Flüssigkeit diskutiert, die trägheitslos zwischen zwei parallelen Wänden strömt, wenn die obere Wand mit konstanter Geschwindigkeit bewegt wird und an der unteren, in Ruhe befindlichen eine gleichförmige konstante Absaugung erfolgt. Das Spannungsfeld wird indessen im einzelnen nur für den Spezialfall diskutiert, daß auch die obere Wand ruht, und die infolge der Absaugung entstehenden Effekte werden aufgezeigt. Der wichtigste Unterschied im Verhalten einer viskoelastischen Flüssigkeit, verglichen mit einerNewtonschen Flüssigkeit, besteht darin, daß der Gradient der Normalspannungskomponente in horizontaler Richtung vom Wandabstand abhängt. Abschließend wird noch die Strömung durch ein zylindrisches Rohr mit gleichmäßiger konstanter Absaugung kurz diskutiert. Man findet, daß die Situation hier ganz ähnlich ist wie bei der ebenen Strömung, wenngleich dies nicht aus allgemeinen Betrachtungen gefolgert werden kann.
    Notes: Summary In continuation of an earlier investigation, the present paper discusses the stress distribution in the inertialess flow of a viscoelastic fluid confined between two plane parallel walls, in which the upper wall moves with a constant velocity while the lower is held at rest with a uniform constant suction applied on its surface. However, the stress field is discussed in detail for the case when the upper wall is also held at rest and the effects arising due to application of suction are pointed out. The most important difference in the behaviour of viscoelastic fluid, compared with that ofNewtonian fluid, lies in the fact that the gradient of the normal stress component in the horizontal direction depends on the distance from the walls. A short discussion has also been provided for the flow in a cylindrical tube with uniform constant suction applied on its surface. Though not evident from general considerations, it is seen that the situation here also is quite similar to that of plane flow.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 17 (1978), S. 557-567 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Die Strömung einer viskoelastischen Flüssigkeit vom Rivlin-Ericksen-Typ zwischen zwei rotierenden koaxialen Kreisscheiben wird numerisch untersucht. Die das Problem beschreibenden nichtlinearen Differentialgleichungen werden in analogen Gleichungen für finite Differenzen umgeschrieben und unter angepaßten Randbedingungen mit einem punktweisen Über-Relaxations-Verfahren (SOR) gelöst. Es werden zwei interessierende Fälle behandelt, zuerst der Fall, bei dem eine Platte ruht und die andere mit konstanter Winkelgeschwindigkeit rotiert, als zweiter derjenige, bei dem beide Platten mit gleichen konstanten Winkelgeschwindigkeiten, jedoch entgegengesetztem Drehsinn rotieren. Typische Beispiele für Reynoldszahlen zwischen 10 und 1000 werden für verschiedene Werte der nicht-newtonschen Parameter beschrieben und die Ergebnisse mit denen für newtonsche Flüssigkeiten verglichen.
    Notes: Summary A numerical investigation is made of the problem of flow of a viscoelastic fluid of the Rivlin-Ericksen type between rotating coaxial disks. The finite-difference analogues of the governing nonlinear ordinary differential equations are written and the resulting equations are solved using point successive overrelaxation method (SOR) under the appropriate boundary conditions. Two cases of interest are treated, namely, when one of the disk is at rest while the other rotates with a constant angular velocity and when both the disks rotate with constant angular velocities but in the opposite directions. Typical examples of Reynolds numberR in the range 10 ≤R ≤ 1000 are described for various values of the non-Newtonian parameters and results are compared with those for a classical viscous fluid.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 22 (1983), S. 268-274 
    ISSN: 1435-1528
    Keywords: Coating ; planar contraction ; moving boundary ; Oldroyd constitutive equation ; finite-difference method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The industrial process of coating flat surfaces with polymeric substances is numerically simulated by solving the full equations of motion for a flow through a contraction with a moving boundary. The four-constant Oldroyd constitutive equation is used to represent the viscoelastic fluid. Some adjustments to existing finite-difference methods are made in such a way as to avoid singular iterative matrices during the solution process. Results are presented for flow situations with Weissenberg numbers up to about three times larger than any previously published results for this problem.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 9 (1970), S. 419-423 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Das in einer früheren Untersuchung behandelte Problem der Wärmeübertragung in einer unendlich ausgedehnten nicht-Newtonschen Flüssigkeit infolge der stationären Rotation einer Kugel bei verschiedenen thermischen Randbedingungen wird für den Fall der thermisch isolierten Kugel hier ausführlich diskutiert. In erster Linie werden Bedingungen betrachtet, bei denen die Sekundärströmung in zwei getrennte Zonen zerfällt und die Konvektion von erheblich stärkerem Einfluß ist als die Dissipationseffekte infolge Viskoelastizität. Man findet, daß die Änderung der Sekundärströmung vom Beginn der Trennung in zwei Zonen bis zur vollständigen Richtungsumkehr von einer ausgeprägten Änderung der Temperaturverteilung begleitet ist. Der hier untersuchte Fall entspricht genähert den Bedingungen eines vor kurzem beschriebenen Experiments, bei dem Silikonöl verwendet wurde. Die vorhergesagten Ergebnisse stimmen mit den beobachteten in qualitativer Hinsicht recht gut überein.
    Notes: Summary In continuation of an earlier investigation, where the problem of heat transfer due to a sphere steadily rotating in an infinitely extending non-Newtonian fluid is discussed under various types of thermal boundary conditions, we presently reconsider this problem for the case in which the sphere is thermally insulated in some more details. The main attention is given to a situation where the secondary flow breaks down into two distinct zones and in which heat convection is strongly dominating over dissipation effects due to viscoelasticity. It is found that, for flow situations from beginning of separation up to complete reversal, the temperature distribution also undergoes marked changes. The chosen conditions correspond to those used in a recently reported experiment performed with polysiloxane. The theoretical and the observed results provide a fairly good qualitative agreement.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Applied microbiology and biotechnology 7 (1979), S. 99-102 
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The effect of lithium on growth and aflatoxin production in chemically defined medium was studied on three aflatoxigenic strains of Asperigillus flavus group. The three strains used differed in their aflatoxin producing capacities. The possible mechanism of lithium induced stimulation of aflatoxin biosynthesis is discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...